Alert archive / Iowa / Flash Flood Warnings in 2012

Flash Flood Warning 6, NWS Quad Cities, IA

May 4, 2012Lee County, Van Buren County, Iowa; Clark County, Scotland County, Missouri

NWS Quad Cities, IA issued this flash flood warning at May 4, 2012, 2:40 AM CDT for Lee County, Van Buren County, Iowa; Clark County, Scotland County, Missouri. It was in force for 6 hr. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 4, 2012, 2:40 AM CDT (07:40 UTC)
Expired: May 4, 2012, 8:45 AM CDT
In force: 6 hr
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Flood severity: None

Counties Lee County, IA, Van Buren County, IA, Clark County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 145 km from the middle of the area, began a volume at 07:42 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
May 4, 3:35 AM CDT	FLASH FLOOD	1 Wnw Kahoka, MO	HALF A FOOT OF STANDING WATER ON SOME ROADS IN KAHOKA.
May 4, 4:41 AM CDT	HEAVY RAIN 2.5	3 Nne Charlie Heath Mem, IA	TOTAL BETWEEN 1255 AM AND 0430 AM
May 4, 7:20 AM CDT	HEAVY RAIN 2.5	5 E Cantril, IA	STILL RAINING
May 4, 8:28 AM CDT	HEAVY RAIN 2.5	2 Ne Fort Madison, IA	TOTAL SO FAR

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 7.7 hours before the alert went out and 150 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1056 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 1420 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 100 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

115 
WGUS53 KDVN 040740
FFWDVN
IAC111-177-MOC045-199-041345-
/O.NEW.KDVN.FF.W.0006.120504T0740Z-120504T1345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
240 AM CDT FRI MAY 4 2012

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CLARK COUNTY IN NORTHEAST MISSOURI...
  THIS INCLUDES THE CITY OF KAHOKA...
  SCOTLAND COUNTY IN NORTHEAST MISSOURI...
  THIS INCLUDES THE CITY OF MEMPHIS...
  LEE COUNTY IN SOUTHEAST IOWA...
  THIS INCLUDES THE CITIES OF...KEOKUK...FORT MADISON...
  SOUTHERN VAN BUREN COUNTY IN SOUTHEAST IOWA...
  THIS INCLUDES THE CITY OF KEOSAUQUA...

* UNTIL 845 AM CDT

* AT 233 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  VERY HEAVY RAINFALL OF 1 TO 2 INCHES PER HOUR...WHICH IS PRODUCING
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.  RAINFALL
  AMOUNTS OF UP TO 3 INCHES HAS ALREADY FALLEN...WITH MORE STORMS
  TO FOLLOW. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MILTON...
  CANTRIL...BONAPARTE...BENTONSPORT/VERNON...WEST POINT...ST. PAUL...
  PILOT GROVE...NEW BOSTON...FRANKLIN...DONNELLSON...DENMARK AND
  CROTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL OF 1 TO 2 INCHES IS POSSIBLE.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING...ESPECIALLY WHILE DRIVING.

&&

LAT...LON 4061 9219 4070 9217 4080 9171 4080 9141
      4077 9130 4072 9121 4070 9112 4067 9112
      4064 9119 4064 9125 4062 9134 4055 9141
      4051 9137 4040 9137 4036 9145 4024 9151
      4025 9195 4030 9196 4031 9234 4060 9236

$$

LE

2 follow-up statements

793 
WGUS73 KDVN 040920
FFSDVN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
420 AM CDT FRI MAY 4 2012

IAC111-177-MOC045-199-041345-
/O.CON.KDVN.FF.W.0006.000000T0000Z-120504T1345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
VAN BUREN IA-LEE IA-CLARK MO-SCOTLAND MO-
420 AM CDT FRI MAY 4 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 AM CDT FOR
SCOTLAND...CLARK...LEE AND SOUTHERN VAN BUREN COUNTIES...

AT 413 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE THUNDERSTORMS OVER THE AREA PRODUCING VERY HEAVY RAIN OVER 
THE WARNED AREA.  THE STORMS ARE EXPECTED TO MOVE OUT OF THE AREA IN 
THE NEXT COUPLE HOURS...BUT UNTIL THEN RAINFALL AMOUNTS OF UP TO 5 
INCHES ARE POSSIBLE FOR THE EVENT TOTAL.  RAINFALL RATES HAVE 
DIMINISHED SOMEWHAT...BUT ARE STILL FALLING AT UP TO AN INCH PER 
HOUR.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO NEW BOSTON...
MILTON...KEOSAUQUA...CANTRIL...BONAPARTE...BENTONSPORT/VERNON...WEST
POINT...ST. PAUL...PILOT GROVE...FRANKLIN...FORT MADISON...
DONNELLSON...DENMARK AND CROTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING...ESPECIALLY WHILE DRIVING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 500 AM CDT FRIDAY
MORNING FOR WEST CENTRAL ILLINOIS. A SEVERE THUNDERSTORM WATCH ALSO
REMAINS IN EFFECT UNTIL 500 AM CDT FRIDAY MORNING FOR SOUTHEAST IOWA
AND NORTHEAST MISSOURI.

&&

LAT...LON 4061 9219 4070 9217 4080 9171 4080 9141
      4077 9130 4072 9121 4070 9112 4067 9112
      4064 9119 4064 9125 4062 9134 4055 9141
      4051 9137 4040 9137 4036 9145 4024 9151
      4025 9195 4030 9196 4031 9234 4060 9236

$$

LRE

966 
WGUS73 KDVN 041345
FFSDVN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
845 AM CDT FRI MAY 4 2012

IAC111-177-MOC045-199-041355-
/O.EXP.KDVN.FF.W.0006.000000T0000Z-120504T1345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
VAN BUREN IA-LEE IA-CLARK MO-SCOTLAND MO-
845 AM CDT FRI MAY 4 2012

...THE FLASH FLOOD WARNING HAS EXPIRED FOR SCOTLAND...CLARK...LEE AND
SOUTHERN VAN BUREN COUNTIES...

LAT...LON 4061 9219 4070 9217 4080 9171 4080 9141
      4077 9130 4072 9121 4070 9112 4067 9112
      4064 9119 4064 9125 4062 9134 4055 9141
      4051 9137 4040 9137 4036 9145 4024 9151
      4025 9195 4030 9196 4031 9234 4060 9236

$$

08

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 3, 7:31 PM CDT	Special Weather Statement	DVN	Benton	29 min
May 3, 8:23 PM CDT	Special Weather Statement	DVN	Louisa, Washington	52 min
May 3, 8:23 PM CDT	Severe Thunderstorm Warning	DVN	Benton	15 min
May 3, 8:27 PM CDT	Tornado Warning	DVN	Henry, Jefferson, Louisa, Washington	33 min
May 3, 8:40 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Johnson, Linn	35 min
May 3, 8:58 PM CDT	Tornado Warning	DVN	Henry, Louisa, Muscatine, Washington	32 min
May 3, 9:14 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Clinton, Scott	31 min
May 3, 9:29 PM CDT	Tornado Warning	DVN	Louisa, Muscatine	17 min
May 3, 9:46 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Muscatine, Scott	43 min
May 3, 9:58 PM CDT	Flash Flood Warning	DVN	Keokuk, Louisa, Washington	6 hr
May 3, 10:20 PM CDT	Flash Flood Warning	DVN	Cedar, Johnson, Louisa, Muscatine, Washington	6 hr
May 3, 10:22 PM CDT	Severe Thunderstorm Warning	DVN	Clinton, Scott	38 min
May 3, 10:44 PM CDT	Flash Flood Warning	DVN	Louisa, Scott	6 hr
May 3, 11:59 PM CDT	Flash Flood Watch	DVN	Des Moines, Henry, Jefferson, Keokuk, Lee, Louisa and 4 more	9 hr
May 4, 12:06 AM CDT	Severe Thunderstorm Warning	DVN	Louisa, Muscatine	24 min
May 4, 1:10 AM CDT	Flash Flood Warning	DVN	Henry, Jefferson	6 hr
May 4, 2:26 AM CDT	Special Weather Statement	DVN	Des Moines, Lee, Van Buren	49 min
May 4, 3:07 AM CDT	Severe Thunderstorm Warning	DVN	Lee	38 min
May 4, 4:04 AM CDT	Areal Flood Warning	DVN	Louisa, Muscatine, Washington	9 hr
May 4, 6:26 AM CDT	Severe Thunderstorm Warning	DVN	Keokuk	49 min
May 4, 6:34 AM CDT	Flash Flood Warning	DVN	Keokuk	4 hr
May 4, 11:59 AM CDT	River Flood Warning	DVN	Des Moines, Henry, Lee	71 hr
May 4, 3:31 PM CDT	Flash Flood Watch	DVN	Benton, Cedar, Clinton, Des Moines, Henry, Iowa and 12 more	11 hr
May 4, 8:21 AM CDT	River Flood Warning	DVN	Clark	48 hr
May 4, 8:50 AM CDT	Areal Flood Warning	DVN	Clark	6 hr

Nearby

Flash Flood Warnings in Iowa, 2012 Flash Flood Warnings in Missouri, 2012 Every flash flood warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.